US11454316B2 - Continuous variable transmission hydraulic pressure control device - Google Patents

Continuous variable transmission hydraulic pressure control device Download PDF

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Publication number
US11454316B2
US11454316B2 US17/038,149 US202017038149A US11454316B2 US 11454316 B2 US11454316 B2 US 11454316B2 US 202017038149 A US202017038149 A US 202017038149A US 11454316 B2 US11454316 B2 US 11454316B2
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oil
friction element
valve
switch valve
pressure
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US20210364083A1 (en
Inventor
Young Joon Kim
Hyun Suk Kim
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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Assigned to KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY reassignment KIA MOTORS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, HYUN SUK, KIM, YOUNG JOON
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
    • F16H61/0009—Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0206—Layout of electro-hydraulic control circuits, e.g. arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types
    • F16D25/14—Fluid pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D48/0206—Control by fluid pressure in a system with a plurality of fluid-actuated clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H59/72—Inputs being a function of gearing status dependent on oil characteristics, e.g. temperature, viscosity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
    • F16H61/0265—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
    • F16H61/0267—Layout of hydraulic control circuits, e.g. arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/70—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements
    • F16H61/702—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements using electric or electrohydraulic control means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2022—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by a proportional solenoid
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0126—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6343—Electronic controllers using input signals representing a temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0221—Valves for clutch control systems; Details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/10—Clutch systems with a plurality of fluid-actuated clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0251—Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
    • F16H2061/0255—Solenoid valve using PWM or duty-cycle control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
    • F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
    • F16H2061/0279—Details of hydraulic valves, e.g. lands, ports, spools or springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
    • F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves

Definitions

  • the present disclosure relates to a continuous variable transmission (CVT) hydraulic pressure control device, and more particularly, to a technique for switching forward and rearward movement states of a continuous variable transmission (CVT) by hydraulic pressure.
  • CVT continuous variable transmission
  • a continuous variable transmission (CVT) using a belt as a variator may be switched between a forward movement state and a rearward movement state by a transmission ratio continuously changed by changing a pulley ratio between a driving pulley and a driven pulley, and by hydraulic pressure provided to control rotation elements of a forward-rearward device connected to the driving pulley or the driven pulley using a friction element such as a clutch or brake.
  • a forward friction element indicates a friction element that enables the forward-rearward device to implement the forward movement state of the CVT
  • a rearward friction element indicates a friction element that enables the forward-rearward device to implement the rearward movement state of the CVT.
  • the CVT may be in the forward movement state (D stage) or the rearward movement state (R stage) by hydraulic pressure supplied to the forward friction element or the rearward friction element. Then, when the CVT is switched to a neutral (N) stage, the hydraulic pressure needs to be discharged at an appropriate speed from the forward friction element or the rearward friction element to which the hydraulic pressure was supplied.
  • This phenomenon may be greatly influenced by a change in oil viscosity based on a temperature of oil supplied to the forward friction element or the rearward friction element.
  • the present disclosure provides a continuous variable transmission (CVT) hydraulic pressure control device preventing a vehicle from an unnecessary movement or impact by allowing hydraulic pressure supplied to a forward friction element or a rearward friction element of the CVT to be released at an appropriate speed despite a change in oil viscosity based on an oil temperature when the CVT is switched to a neutral (N) stage.
  • CVT continuous variable transmission
  • a continuous variable transmission (CVT) hydraulic pressure control device includes: a pressure regulation valve regulating an operation pressure of oil supplied to a friction element of a forward-rearward device; and a switch valve configured to respectively switch oil discharge paths through which the oil supplied to the friction element is discharged, by a pilot pressure from the pressure regulation valve and an elastic force of a return spring.
  • the oil discharge paths switched by the switch valve are configured to have oil flow resistances different from each other.
  • the pressure regulation valve may be a solenoid valve; and a controller controlling the pressure regulation valve may be configured to regulate the pilot pressure supplied to the switch valve based on a temperature of the oil.
  • the switch valve may include: a first port to which the operation pressure from the pressure regulation valve is supplied, a second port connected to the friction element and a third port through which oil discharged from the friction element is discharged.
  • the switch valve may be configured to be switched between a first state in which the second port and the third port are communicated with each other and a second state in which the first port and the second port are communicated with each other.
  • the return spring is configured to cause the switch valve to be in the first state, and when an elastic force of the return spring is overcome by the pilot pressure from the pressure regulation valve, the switch valve is switched to the second state.
  • the controller may be configured to control the pressure regulation valve to have the pilot pressure switching the switch valve to the second state when the oil temperature is a predetermined reference temperature or above.
  • the oil discharge path formed when the switch valve is in the first state may have smaller oil flow resistance than the oil discharge path formed when the switch valve is in the second state.
  • the switch valve may be installed between a manual valve and the friction element to supply the operation pressure from the pressure regulation valve to the friction element through the manual valve operated by a transmission lever.
  • the switch valve may be connected to the manual valve to receive the oil discharged from the friction element through the manual valve operated by the transmission lever and then to discharge the received oil.
  • the friction element of the forward-rearward device may be configured to include a forward friction element implementing a forward movement state and a rearward friction element implementing a rearward movement state; and at least one switch valve may be included in at least one of the forward friction element and the rearward friction element to switch the oil discharge paths.
  • FIG. 1 is a view showing a first form of a continuous variable transmission (CVT) hydraulic pressure control device in one form of the present disclosure, showing a state in which a rearward (R) stage is implemented;
  • CVT continuous variable transmission
  • FIG. 2 is a view describing that the form of FIG. 1 is switched to a neutral (N) stage under a high temperature condition and oil is thus discharged from a rearward friction element;
  • FIG. 3 is a view describing that the form of FIG. 1 is switched to a neutral (N) stage under a low temperature condition and oil is thus discharged from a rearward friction element;
  • FIG. 4 is a view showing a second form of a continuous variable transmission (CVT) hydraulic pressure control device according to another form of the present disclosure
  • FIG. 5 is a view showing a third form of a continuous variable transmission (CVT) hydraulic pressure control device according to one form of the present disclosure.
  • CVT continuous variable transmission
  • FIG. 6 is a view describing an example of a continuous variable transmission (CVT) to which the present disclosure may be applied.
  • CVT continuous variable transmission
  • CVT continuous variable transmission
  • FIG. 6 shows a structure of a continuous variable transmission (CVT) to which the present disclosure may be applied.
  • the structure may be configured in a following manner: when power is input from a power source such as an engine through a torque converter (TC), the power may be transmitted to a driving pulley 3 through a forward-rearward device 1 including a planetary gear device (PG); the power transmitted to the driving pulley 3 may be transmitted to a driven pulley 7 through a belt 5 ; and then the power may be drawn to a drive wheel through a differential 9 .
  • TC torque converter
  • PG planetary gear device
  • the forward-rearward device 1 may include a rearward friction element (R_FE) capable of fixing a ring gear (R) of the planetary gear device (PG) and a forward friction element (F_FE) capable of connecting a sun gear (S) with a carrier (C).
  • R_FE rearward friction element
  • F_FE forward friction element
  • all forms of the present disclosure may be configured to commonly include: a pressure regulation valve 11 regulating an operation pressure of oil supplied to the friction element (FE) of the forward-rearward device 1 ; and a switch valve (TV) installed to switch paths through which the oil supplied to the friction element (FE) is discharged, respectively by a pilot pressure from the pressure regulation valve 11 and an elastic force of a return spring 13 .
  • a pressure regulation valve 11 regulating an operation pressure of oil supplied to the friction element (FE) of the forward-rearward device 1
  • TV switch valve
  • the oil discharge paths switched by the switch valve (TV) may be configured to have oil flow resistance different from each other.
  • the forward-rearward device 1 may include: the planetary gear device (PG) connected to the driving pulley 3 configuring a conventional CVT or the driven pulley; and the friction element (FE) such as a brake or clutch that restrains or connects the rotation elements of this planetary gear (PG).
  • the friction element such as a brake or clutch that restrains or connects the rotation elements of this planetary gear (PG).
  • the friction element (FE) may be configured of: the forward friction element (F_FE) that enables the forward movement by the hydraulic pressure provided thereto; and the rearward friction element (R_FE) that enables the rearward movement by the hydraulic pressure provided thereto.
  • the pressure regulation valve 11 may be a solenoid valve, and a controller (CLR) controlling the pressure regulation valve 11 may be configured to regulate the pilot pressure supplied to the switch valve (TV) based on a temperature of the oil.
  • CLR controller
  • the pressure regulation valve 11 may be configured to receive line pressure famed by an oil pump and a regulator valve, and be driven by an electrical signal from the controller (CLR) to regulate and provide appropriate hydraulic pressure to the friction element.
  • CLR controller
  • the pressure regulation valve 11 may appropriately regulate and supply the hydraulic pressure to the forward friction element (F_FE) or the rearward friction element (R_FE), thereby enabling a smooth switch without the impact.
  • the operation pressure may indicate the hydraulic pressure supplied by the pressure regulation valve 11 to the forward friction element (F_FE) or the rearward friction element (R_FE), and the pilot pressure may indicate the hydraulic pressure supplied to operate the switch valve (TV).
  • FIG. 1 shows a situation in which the operation pressure and the pilot pressure are supplied simultaneously
  • FIG. 2 shows a situation in which only the pilot pressure is supplied.
  • the switch valve (TV) may include a first port P 1 to which the operation pressure from the pressure regulation valve 11 is supplied, a second port P 2 connected to the friction element and a third port P 3 discharging oil discharged from the friction element, and the switch valve may be configured to be switched between a first state in which the second port P 2 and the third port P 3 are communicated with each other and a second state in which the first port P 1 and the second port P 2 are communicated with each other.
  • the switch valve (TV) may be configured to have the first state by the return spring 13 , and have the second state by overcoming the elastic force of the return spring 13 by the pilot pressure from the pressure regulation valve 11 .
  • the controller (CLR) may be configured to control the pressure regulation valve 11 to have the pilot pressure switching the switch valve (TV) to the second state when the oil temperature is a predetermined reference temperature or above.
  • the controller may receive information on the oil temperature directly from a separate oil temperature sensor or receive the information on the oil temperature from another controller, etc.
  • the reference temperature may be set to a level to distinguish whether or not the unnecessary movement of the vehicle may occur in the N stage due to a speed which becomes slower than a general oil-discharge speed when the oil is discharged from the friction element.
  • the reference temperature may be determined by experiments and analyses.
  • the oil discharge path formed when the switch valve (TV) is in the first state may have smaller oil flow resistance than the oil discharge path formed when the switch valve (TV) is in the second state.
  • the oil discharge path formed when the switch valve (TV) is in the first state may have smaller oil flow resistance than the oil discharge path formed when the switch valve (TV) is in the second state because the pilot pressure does not act due to the oil temperature below the reference temperature, and therefore, the oil may be discharged more smoothly even when having higher viscosity.
  • the friction element may have the following speeds famed almost similar to each other: a speed at which the hydraulic pressure is released when the switch valve (TV) is in the second state at the reference temperature or above; and a speed at which the hydraulic pressure is released when the switch valve (TV) is in the first state at a temperature below the reference temperature.
  • the oil discharge path formed in the second state may be configured to have the flow resistance at a level in which the impact does not occur because the speed at which the hydraulic pressure is released from the friction element is not too fast when the CVT is switched to the N stage in a normal situation where the oil temperature is the reference temperature or above.
  • a magnitude of the flow resistance in the oil discharge path may be implemented by regulating a minimum flow cross-sectional area of each path. That is, for example, at least a portion of the oil discharge path formed when the switch valve (TV) is in the second state may be implemented to include an orifice having a smaller cross-sectional area than any portion of the oil discharge path formed in the first state, etc.
  • the orifice having the above structure may be installed at any position on the oil discharge path formed when the switch valve (TV) is in the second state.
  • FIGS. 1 to 3 show the first form in which the switch valve (TV) is installed between a manual valve (MV) and the friction element to supply the operation pressure from the pressure regulation valve 11 to the friction element through the manual valve (MV) operated by a transmission lever (TL).
  • TV switch valve
  • MV manual valve
  • TL transmission lever
  • the manual valve may further include an option of a parking state (P stage).
  • At least one switch valve (TV) may be included in at least one of the forward friction element (F_FE) and the rearward friction element (R_FE) to switch the oil discharge paths.
  • FIG. 4 shows the second form in which a total of two switch valves are provided including an additional switch valve (TV A), thereby switching the discharge paths of the oil discharged from the forward friction element (F_FE) as well as from the rearward friction element (R_FE).
  • FIG. 5 shows the third form of the present disclosure in which the switch valve (TV) is connected to the manual valve (MV) to receive the oil discharged from the friction element through the manual valve (MV) operated by the transmission lever (TL) and then to discharge the received oil.
  • FIGS. 1 to 3 An operation of the present disclosure is described based on the first form of FIGS. 1 to 3 .
  • FIG. 1 shows a state in which the manual valve (MV) selects the R stage and the operation pressure of the pressure regulation valve 11 is supplied to the rearward friction element (R_FE), thereby implementing the rearward movement of the vehicle.
  • the pilot pressure supplied from the pressure regulation valve 11 to the switch valve (TV) may allow the switch valve (TV) to have the second state, and the hydraulic pressure supplied through the manual valve (MV) may be provided to the rearward friction element (R_FE) through the first port P 1 and the second port P 2 .
  • the state When a driver operates the transmission lever (TL) in the rearward movement state as described above to switch the manual valve (MV) to the N stage, the state may be switched to the state shown in FIG. 2 or the state shown in FIG. 3 .
  • the controller (CLR) may drive the pressure regulation valve 11 so that the pilot pressure allows the switch valve (TV) to continuously maintain the second state as shown in FIG. 2 .
  • the pilot pressure may not be provided or provided to act only at a level in which the pilot pressure cannot overcome the elastic force of the return spring 13 , thereby allowing the switch valve (TV) to have the first state as shown in FIG. 3 .
  • the oil discharge path through which the oil of the rearward friction element (R_FE) is discharged and which is famed when the switch valve (TV) has the first state may have smaller flow resistance than the oil discharge path famed when the switch valve (TV) has the second state. Therefore, the oil of the rearward friction element (R_FE) may be smoothly discharged even in the lower temperature condition where the oil viscosity is higher, thereby effectively preventing the unnecessary movement of the vehicle in the N stage.
  • the present disclosure may prevent the vehicle from the unnecessary movement or impact by allowing the hydraulic pressure supplied to the forward friction element or the rearward friction element of the continuous variable transmission (CVT) to be released at an appropriate speed despite the change in the oil viscosity based on the oil temperature when the CVT is switched to the neutral (N) stage, and may implement such a function at a very low cost.
  • CVT continuous variable transmission
US17/038,149 2020-05-19 2020-09-30 Continuous variable transmission hydraulic pressure control device Active 2040-12-23 US11454316B2 (en)

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KR1020200059603A KR20210143359A (ko) 2020-05-19 2020-05-19 Cvt 유압 제어 장치
KR10-2020-0059603 2020-05-19

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106233042A (zh) * 2014-04-25 2016-12-14 腓特烈斯港齿轮工厂股份公司 包括多个压力调节阀的变速器的液压系统
KR20170068699A (ko) 2015-12-09 2017-06-20 현대자동차주식회사 Cvt 유압 제어 장치
CN107448595A (zh) * 2017-09-15 2017-12-08 北京理工大学 一种液力机械自动变速箱的电液操纵系统及操控方法
US20190275998A1 (en) * 2018-03-07 2019-09-12 Subaru Corporation Control apparatus of transmission and method of controlling transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106233042A (zh) * 2014-04-25 2016-12-14 腓特烈斯港齿轮工厂股份公司 包括多个压力调节阀的变速器的液压系统
KR20170068699A (ko) 2015-12-09 2017-06-20 현대자동차주식회사 Cvt 유압 제어 장치
CN107448595A (zh) * 2017-09-15 2017-12-08 北京理工大学 一种液力机械自动变速箱的电液操纵系统及操控方法
US20190275998A1 (en) * 2018-03-07 2019-09-12 Subaru Corporation Control apparatus of transmission and method of controlling transmission

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